My Youtube stream is kinda blurry but my internet and PC are more than capable of streaming?

Has YouTube (or maybe your browser) figured out that you have a fast download? So that YT’s automatic quality setting actually gives you something good instead of 480 or something like that? Even if you give it a good upload, you won’t see the results if it still thinks you need a postage stamp sized screen to watch it back smoothly.

Or, maybe your dedicated connection is still lousy for actual streaming. Annoyingly, the speedtest doesn’t actually measure that. I wish it did…